Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd19c88045fcf61…

MALICIOUS

PDF

126.3 KB Created: 2021-06-20 14:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 889960a4b744ef871d476b6775feef22 SHA-1: fa0a9a09487d4246594a6c3bf2a5cd42db9909eb SHA-256: 5dd19c88045fcf6141db45623933a942346bfba428ec6c115b770ca0620d07b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://queure.ru/uplcv?utm_term=bhyrappa+novels+pdf PDF link annotation
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8eccdee1c---33963298695.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3c3dc201b95fef5c51a578bf084e7592/76821992913.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0fa05d524---67604063943.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d7ccb53b3---47342299163.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/kogijagokowenoso.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/pusigipososejumozomidi.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/kapuxi.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607017110ea3d---96675833535.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/vepemewolowodapadoj.pdfIn PDF document text
    • https://anup.bo/images/files/85362017112.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/94240245052.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/d4eace3729afb7e78e89a1711ed7e18c/88617882653.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/47586938155.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/d7e819fd7d0bbbe0a9cceebfd902d352/zoxupanelorik.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b3e71159f---xosisuxox.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/68174931533.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608052826a7b7---juwurote.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001a73a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A73A 9796 bytes
SHA-256: 58fb19a283a7a58602cce619dfe7a030b491e4c1b936ba25819eacb85e1c5d87
font_00_sfnt_off00019506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19506 5340 bytes
SHA-256: aec46c7a3c5fb77e02ade2e69f37836f6e110d30029622fe9c9034a72de3dd7b
font_02_sfnt_off0001c1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C1A4 13212 bytes
SHA-256: 25f4a18f00a5a2d48d9365e883f39a7da46859d052882a57d594f3e21b9f569b